/* ============================================================
   Tempo Timesheet Automation - Presentation Site
   Dark theme, single-page, responsive
   ============================================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --bg-card-hover: #263548;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-blue: #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-green: #22c55e;
  --accent-orange: #f59e0b;
  --accent-red: #ef4444;
  --accent-cyan: #06b6d4;
  --border: #334155;
  --gradient: linear-gradient(135deg, #3b82f6, #8b5cf6);
  --gradient-text: linear-gradient(135deg, #60a5fa, #a78bfa);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
  --radius: 12px;
  --radius-sm: 8px;
  --max-width: 1200px;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* --- Navigation --- */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 0;
}

nav .nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

nav .nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-primary);
  text-decoration: none;
}

nav .nav-brand img {
  width: 28px;
  height: 28px;
  border-radius: 4px;
}

nav .nav-links {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

nav .nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
  white-space: nowrap;
}

nav .nav-links a:hover {
  color: var(--text-primary);
  background: var(--bg-secondary);
}

/* --- Sections --- */
section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 5rem 2rem;
}

section + section {
  border-top: 1px solid var(--border);
}

.section-label {
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-blue);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.section-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin-bottom: 3rem;
}

/* --- Hero --- */
.hero {
  text-align: center;
  padding: 8rem 2rem 6rem;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-tagline {
  font-size: 1.35rem;
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto 2.5rem;
}

.stats-bar {
  display: flex;
  justify-content: center;
  gap: 3rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.cta-btn {
  display: inline-block;
  padding: 0.9rem 2.5rem;
  background: var(--gradient);
  color: #fff;
  text-decoration: none;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1.05rem;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: var(--shadow);
}

.cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
}

/* --- Cards --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card-grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-blue);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1rem;
  background: rgba(59, 130, 246, 0.1);
  color: var(--accent-blue);
}

.card-icon.green { background: rgba(34, 197, 94, 0.1); color: var(--accent-green); }
.card-icon.purple { background: rgba(139, 92, 246, 0.1); color: var(--accent-purple); }
.card-icon.orange { background: rgba(245, 158, 11, 0.1); color: var(--accent-orange); }
.card-icon.cyan { background: rgba(6, 182, 212, 0.1); color: var(--accent-cyan); }
.card-icon.red { background: rgba(239, 68, 68, 0.1); color: var(--accent-red); }

.card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* --- Before/After --- */
.comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.comparison-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
}

.comparison-card.before {
  border-top: 3px solid var(--accent-red);
}

.comparison-card.after {
  border-top: 3px solid var(--accent-green);
}

.comparison-card h3 {
  font-size: 1.1rem;
  margin-bottom: 1.25rem;
}

.comparison-card .before-label { color: var(--accent-red); }
.comparison-card .after-label { color: var(--accent-green); }

.comparison-item {
  display: flex;
  justify-content: space-between;
  padding: 0.6rem 0;
  border-bottom: 1px solid rgba(51, 65, 85, 0.5);
  font-size: 0.95rem;
}

.comparison-item:last-child { border-bottom: none; }

.comparison-item .label { color: var(--text-secondary); }
.comparison-item .value { font-weight: 600; }

/* --- Flow Steps --- */
.flow-steps {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  margin: 2rem 0;
}

.flow-step {
  text-align: center;
  flex: 1;
  min-width: 200px;
  max-width: 300px;
}

.flow-step-number {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--gradient);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
  margin: 0 auto 1rem;
}

.flow-step h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.flow-step p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.flow-arrow {
  display: flex;
  align-items: center;
  color: var(--text-muted);
  font-size: 1.5rem;
  padding-top: 0.5rem;
}

/* --- Table --- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

.data-table th,
.data-table td {
  padding: 0.85rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.data-table th {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  font-weight: 600;
}

.data-table td {
  font-size: 0.95rem;
}

.data-table tr:hover td {
  background: rgba(59, 130, 246, 0.05);
}

.highlight-row td {
  font-weight: 700;
  color: var(--accent-green);
}

/* --- Timeline --- */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--gradient);
}

.timeline-item {
  position: relative;
  padding: 0 0 2.5rem 2rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2rem;
  top: 0.35rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-blue);
  border: 2px solid var(--bg-primary);
  transform: translateX(-5px);
}

.timeline-item .version-tag {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-blue);
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.timeline-item .date {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.timeline-item h3 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.timeline-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* --- Code Block --- */
.code-block {
  background: #0d1117;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem;
  font-family: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', 'Consolas', monospace;
  font-size: 0.9rem;
  line-height: 1.6;
  overflow-x: auto;
  color: #c9d1d9;
  margin: 1rem 0;
}

.code-block .comment { color: #8b949e; }
.code-block .keyword { color: #ff7b72; }
.code-block .string { color: #a5d6ff; }
.code-block .success { color: #3fb950; }
.code-block .info { color: #58a6ff; }

/* --- Badge --- */
.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-blue { background: rgba(59, 130, 246, 0.15); color: var(--accent-blue); }
.badge-green { background: rgba(34, 197, 94, 0.15); color: var(--accent-green); }
.badge-purple { background: rgba(139, 92, 246, 0.15); color: var(--accent-purple); }
.badge-orange { background: rgba(245, 158, 11, 0.15); color: var(--accent-orange); }

/* --- Screenshot Gallery --- */
.screenshot-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.screenshot-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.screenshot-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-blue);
}

.screenshot-card img {
  width: 100%;
  height: auto;
  display: block;
  border-bottom: 1px solid var(--border);
}

.screenshot-caption {
  padding: 1rem 1.25rem;
}

.screenshot-caption strong {
  display: block;
  font-size: 0.95rem;
  margin-bottom: 0.35rem;
}

.screenshot-caption p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin: 0;
}

/* --- Architecture Diagram --- */
.arch-diagram {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 2rem 0;
}

.arch-row {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.arch-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1.25rem;
  text-align: center;
  min-width: 160px;
}

.arch-box .class-name {
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

.arch-box .class-info {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.arch-box.highlight {
  border-color: var(--accent-blue);
  background: rgba(59, 130, 246, 0.08);
}

.arch-arrow {
  text-align: center;
  color: var(--text-muted);
  font-size: 1.25rem;
}

/* --- Tabs --- */
.tab-container {
  margin: 2rem 0;
}

.tab-buttons {
  display: flex;
  gap: 0.25rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  position: relative;
}

/* Sliding indicator bar under active tab */
.tab-indicator {
  position: absolute;
  bottom: -1px;
  height: 2px;
  background: var(--accent-blue);
  transition: left 0.35s cubic-bezier(0.4, 0, 0.2, 1), width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1;
}

.tab-btn {
  padding: 0.65rem 1.25rem;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.2s;
  font-family: inherit;
}

.tab-btn:hover { color: var(--text-primary); }
.tab-btn.active {
  color: var(--accent-blue);
  border-bottom-color: transparent;
}

/* Tab panels wrapper for carousel slide */
.tab-panels {
  position: relative;
  overflow: hidden;
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* During carousel transition, both panels visible */
.tab-content.sliding {
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .hero-title { font-size: 2.25rem; }
  .hero-tagline { font-size: 1.1rem; }
  .stats-bar { gap: 1.5rem; }
  .stat-number { font-size: 1.75rem; }
  .section-title { font-size: 1.75rem; }
  .comparison { grid-template-columns: 1fr; }
  .flow-arrow { display: none; }
  .flow-steps { gap: 1.5rem; }
  nav .nav-links { display: none; }
  section { padding: 3rem 1.25rem; }
}

@media (max-width: 480px) {
  .hero { padding: 5rem 1rem 3rem; }
  .hero-title { font-size: 1.75rem; }
  .card-grid { grid-template-columns: 1fr; }
}

/* --- Utility --- */
.text-center { text-align: center; }
.text-muted { color: var(--text-secondary); }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mt-2 { margin-top: 1rem; }
.mt-4 { margin-top: 2rem; }
.flex-center { display: flex; align-items: center; justify-content: center; }

/* --- Platform badges --- */
.platform-badges {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  margin: 1.5rem 0;
}

.platform-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* --- Big number highlight --- */
.big-number {
  font-size: 3.5rem;
  font-weight: 900;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

/* --- ROI Box --- */
.roi-box {
  background: var(--bg-card);
  border: 2px solid var(--accent-green);
  border-radius: var(--radius);
  padding: 2.5rem;
  text-align: center;
  margin: 2rem 0;
}

.roi-box .roi-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent-green);
  margin-bottom: 0.5rem;
}

.roi-box .roi-number {
  font-size: 4rem;
  font-weight: 900;
  color: var(--accent-green);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.roi-box .roi-detail {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* --- Footer --- */
footer {
  border-top: 1px solid var(--border);
  padding: 3rem 2rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

footer a {
  color: var(--accent-blue);
  text-decoration: none;
}

footer a:hover { text-decoration: underline; }

/* --- Page View Counter --- */
.page-views {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.2rem;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.page-views .view-icon {
  font-size: 1rem;
}

.page-views .view-count {
  font-weight: 800;
  color: var(--accent-blue);
  font-size: 1rem;
}

.page-views .view-sep {
  color: var(--border);
  margin: 0 0.15rem;
}

/* --- Toggle button for collapsible sections --- */
.toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.9rem;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.2s;
  margin-top: 1rem;
}

.toggle-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent-blue);
}

/* --- Collapsible content (slide down/up) --- */
.collapsible {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height 0.45s cubic-bezier(0.4, 0, 0.2, 1),
              opacity 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}
.collapsible.expanded {
  opacity: 1;
}

/* --- Compact section padding --- */
section.compact { padding: 3rem 2rem; }

/* --- Compact timeline --- */
.timeline-compact .timeline-item { padding-bottom: 1.25rem; }

/* --- Roadmap compact rows --- */
.roadmap-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
}
.roadmap-row:last-child { border-bottom: none; }
.roadmap-row .roadmap-icon { font-size: 1.25rem; flex-shrink: 0; }
.roadmap-row .roadmap-title { font-weight: 600; min-width: 160px; }
.roadmap-row .roadmap-desc { color: var(--text-secondary); font-size: 0.9rem; flex: 1; }
.roadmap-row .badge { flex-shrink: 0; }

@media (max-width: 768px) {
  .roadmap-row { flex-wrap: wrap; }
  .roadmap-row .roadmap-title { min-width: auto; }
  section.compact { padding: 2rem 1.25rem; }
}